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annotate mod_mam/rsm.lib.lua @ 1379:403d5cd924eb

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mod_statistics_mem: Module that collects memory usage stats from /proc
author Kim Alvefur <zash@zash.se>
date Thu, 03 Apr 2014 20:57:22 +0200
parents bfde5e5318d7
children 1a5ae0dee157
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
701
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1 local stanza = require"util.stanza".stanza;
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2 local tostring, tonumber = tostring, tonumber;
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3 local type = type;
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4 local pairs = pairs;
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5
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6 local xmlns_rsm = 'http://jabber.org/protocol/rsm';
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7
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8 local element_parsers;
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9
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10 do
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11 local function xs_int(st)
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12 return tonumber((st:get_text()));
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13 end
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14 local function xs_string(st)
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15 return st:get_text();
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16 end
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17
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18 element_parsers = {
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19 after = xs_string;
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20 before = function(st)
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21 local text = st:get_text();
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22 return text == "" or text;
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23 end;
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24 max = xs_int;
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25 index = xs_int;
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26
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27 first = function(st)
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28 return { index = tonumber(st.attr.index); st:get_text() };
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29 end;
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30 last = xs_string;
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31 count = xs_int;
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32 }
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33 end
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34
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35 local element_generators = setmetatable({
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36 first = function(st, data)
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37 if type(data) == "table" then
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38 st:tag("first", { index = data.index }):text(data[1]):up();
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39 else
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40 st:tag("first"):text(tostring(data)):up();
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41 end
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42 end;
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43 before = function(st, data)
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44 if data == true then
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45 st:tag("before"):up();
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46 else
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47 st:tag("before"):text(tostring(data)):up();
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48 end
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49 end
701
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50 }, {
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51 __index = function(_, name)
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52 return function(st, data)
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53 st:tag(name):text(tostring(data)):up();
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54 end
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55 end;
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56 });
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57
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58
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59 local function parse(stanza)
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60 local rs = {};
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61 for tag in stanza:childtags() do
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62 local name = tag.name;
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63 local parser = name and element_parsers[name];
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64 if parser then
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65 rs[name] = parser(tag);
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66 end
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67 end
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68 return rs;
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69 end
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70
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71 local function generate(t)
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72 local st = stanza("set", { xmlns = xmlns_rsm });
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73 for k,v in pairs(t) do
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74 if element_parsers[k] then
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75 element_generators[k](st, v);
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76 end
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77 end
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78 return st;
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79 end
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80
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81 local function get(st)
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82 local set = st:get_child("set", xmlns_rsm);
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83 if set and #set.tags > 0 then
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84 return parse(set);
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85 end
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86 end
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87
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88 return { parse = parse, generate = generate, get = get };